Use the following procedure to select a tone:
- Press the Tone button that is assigned to the Tone you want to use:
There are four Tone buttons, while there are eight Tones:
- Piano: [Piano 2]
- Harpsichord: [E.Piano]
- Organ 1: [Organ 2]
- Strings: [Choir]
- Here’s what you need to do in order to access the “hidden” Tones:
- First press the Tone button that provides access to the desired Tone.
- Hold down [Reverb] and press the same Tone button again to select the “secondary” Tone (the name printed below the button you press).
- Hold down [Reverb] and press the same Tone button again to return to the “main” Tone.
HP-1 Owner's Manual: https://www.roland.com/global/support/owners_manuals/h_m/